@as-integrations/koa

用于 TypeScript/JavaScript 图形QL 中间软件 @apollo/server

开始: Koa 中间软件

阿波罗服务器启用了添加中间软件的能力,使您能够运行您的 GraphQL 服务器,作为由 Koa 构建的应用程序的一部分, Koa 是节点最受欢迎的网络框架之一.

首先,安装阿波罗服务器,JavaScript执行核心GraphQL算法,Koa以及两个常见的Koa中间软件包:

npm install @as-integrations/koa @apollo/server graphql koa @koa/bodyparser @koa/cors

然后,将以下写入服务器. mjs. (通过使用 .mjs 扩展名,节点允许您在顶级使用等待关键字)

import http from "http";
import Koa from "koa";
import bodyParser from "@koa/bodyparser";
import cors from "@koa/cors";
import { ApolloServer } from "@apollo/server";
import { ApolloServerPluginDrainHttpServer } from "@apollo/server/plugin/drainHttpServer";
import { koaMiddleware } from "@as-integrations/koa";

// The GraphQL schema
const typeDefs = `#graphql
  type Query {
    hello: String
  }
`;

// A map of functions which return data for the schema.
const resolvers = {
  Query: {
    hello: () => "world",
  },
};

const app = new Koa();
const httpServer = http.createServer(app.callback());

// Set up Apollo Server
const server = new ApolloServer({
  typeDefs,
  resolvers,
  plugins: [ApolloServerPluginDrainHttpServer({ httpServer })],
});
await server.start();

app.use(cors());
app.use(bodyParser());
app.use(
  koaMiddleware(server, {
    context: async ({ ctx }) => ({ token: ctx.headers.token }),
  })
);

await new Promise((resolve) => httpServer.listen({ port: 4000 }, resolve));
console.log(`🚀 Server ready at http://localhost:4000`);

现在运行您的服务器 :

node server.mjs

打开它在网页浏览器中打印的 URL 。 它将显示阿波罗沙盒,一个运行GraphQL操作的网络工具. 尝试运行操作 query { hello }来啊!